rather than symlink the webm/vpx terms, use the same header as libvpx to reference in-tree files based on the discussion in: https://codereview.chromium.org/12771026/ Change-Id: Ia3067ecddefaa7ee01550136e00f7b3f086d4af4
Change-Id: I4522cdd5a529f802f1eb566b6d94539612e0976b
Change-Id: I8e3e20787f6c3cc0616bd33beb2a6ccdda1e04f7